Charles H. Spurgeon on Psalms 78:9

The children of Ephraim, being armed, etc. "When ye had girded on every man is weapons of war, ye were ready to go up into the hill. And the Lord said unto me, Say unto them, Go not up, neither fight; for I am not among you; lest ye be smitten before your enemies. So I spake unto you; and ye would not hear, but rebelled against the commandment of the Lord, and went presumptuously up into the hill. And the Amorites, which dwelt in that mountain, came out against you, and chased you, as bees do, and destroyed you in Seir, even unto Hormah." De 1:41-44.